On 02/24/2016 08:54 AM, Alvaro Herrera wrote:
> Joe Conway wrote:
>> In my experience it is almost always best to run autovacuum very often
>> and very aggressively. That generally means tuning scaling factor and
>> thresholds as well, such that there are never more than say 50-100k dead
>> rows. Then running vacuum with no delays or limits runs quite fast is is
>> generally not noticeable/impactful.
>> However that strategy does not work well for vacuums which run long,
>> such as an anti-wraparound vacuum. So in my opinion we need to think
>> about this as at least two distinct cases requiring different solutions.
> With the freeze map there is no need for anti-wraparound vacuums to be
> terribly costly, since they don't need to scan the whole table each
> time.  That patch probably changes things a lot in this area.

Yes, I had forgotten about that. It would be a huge help.

Crunchy Data - http://crunchydata.com
PostgreSQL Support for Secure Enterprises
Consulting, Training, & Open Source Development

Attachment: signature.asc
Description: OpenPGP digital signature

Reply via email to